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Monday, 20 May 2013

Electronic instrumentation-Model question paper for B.E/B.Tech

1(a) State the difference between accuracy and precision of a measurement. (4 Marks)
(b) What are the operating principles of LCD display? (6 Marks)
(c) What are half steps in a dot matrix? Why are they used? (6 Marks)
(d) A 1 mA meter movement with an internal resistance of 100Ω is to be converted into a 0-100 mA. Calculate the value of shunt resistance required. (4 Marks)
2(a) What is the use of a chopper in microvoltmeter? (4 Marks)
(b) Differentiate between a series tyoe ohmmeter and a shunt type ohmmeter. (6 Marks)
(c) Explain the operating principle of a ramp type digital voltmeter. (6 Marks)
(d) Calculate the value of the multiplier resistance on the 50V range of a dc voltmeter, which uses a 200 mA meter movement with an internal resistance of 100Ω. (4 Marks)
3(a) Explain the operation of a digital phase meter. (6 Marks)
(b) Why is a delay line used in the vertical section of an oscilloscope? (4 Marks)
(c) How is magnitude and phase measured on a CRO for two different waves? (6 Marks)
(d) A CRO is set to a time base of 0.1ms/cm amplitude. Sketch the display of the pulse signal waveform with a pulse repetition rate of 2000 Hz and a duty cycle of 25%. (4 Marks)
 4(a) Explain the working of a standard sweep generator with the help of a diagram. (6 Marks)
(b) Explain any one application of a distortion factor meter. (4 Marks)
(c) How does the use of microprocessors be useful in bridge circuits? (5 Marks)
(d) The distribution capacitance was found to be 20 pf by use of a Q meter. The first resonance occurred at C1=300 pf and f1 was half the second resonance frequency. If L=40mH, determine the value of C2 and f2 at the second resonance. (5 Marks)
5 (a) How is automatic balance achieved in a recording instrument? (4 marks)
(b) What is the difference between active and passive transducers? (4 Marks)
(c) Write notes on infrared pyrometers and optical pyrometers. (8 Marks)
(d) If the frequency of a signal to be recorded with a strip-chart recorder is 20 Hz, what must be the chart speed used to record one complete cycle on 5 mm of recording paper? (4 Marks)
6(a) Explain how a transistor can be used as a chopper. (6 Marks)
(b) What are the applications of an instrumentation amplifier? (4 Marks)
(c) What is a Notch filter? How can twin-T be used as a Notch filter? (5 Marks)
(d) Design a low pass filter with a cutoff frequency of 1.5 kHz and pass band gain of 3. (5 Marks)
7 (a) How is the frequency response of an audio amplifier stage measured? (4 Marks)
(b) Why is it necessary to use preamplification and filtering before data processing? (6 Marks)
(c) With the help of a basic block diagram, explain the working of a modem. (6 Marks)
(d) How many bits are required in a binary ladder to achieve a resolution of 1 mV if full scale is +5V? (4 Marks)
8(a) Mention some of the methods used to improve the dissemination of time and frequency standards. (4 Marks)
(b) What are directional couplers? How do they function? (6 Marks)
(c) Differentiate between digital controller and computer supervisory control. (6 Marks)
(d) Explain the working of an analog I/O module. (4 Marks)

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